Merge pull request #103 from wongma7/master

SSH key generator

1 files changed, 231 insertions, 0 deletions

diff --git a/app/src/main/java/com/zeapo/pwdstore/SshKeyGen.java b/app/src/main/java/com/zeapo/pwdstore/SshKeyGen.java
new file mode 100644
index 00000000..52980e5f
--- /dev/null
+++ b/app/src/main/java/com/zeapo/pwdstore/SshKeyGen.java
@@ -0,0 +1,231 @@
+package com.zeapo.pwdstore;
+
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.app.Fragment;
+import android.app.ProgressDialog;
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.SharedPreferences;
+import android.graphics.Typeface;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.v7.app.AlertDialog;
+import android.support.v7.app.AppCompatActivity;
+import android.text.InputType;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.EditText;
+import android.widget.Spinner;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.KeyPair;
+
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+import java.io.FileOutputStream;
+
+public class SshKeyGen extends AppCompatActivity {
+
+    // SSH key generation UI
+    public static class SshKeyGenFragment extends Fragment {
+        public SshKeyGenFragment() {
+        }
+
+        @Override
+        public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                                 Bundle savedInstanceState) {
+            final View v = inflater.inflate(R.layout.fragment_ssh_keygen, container, false);
+            Typeface monoTypeface = Typeface.createFromAsset(getActivity().getAssets(), "fonts/sourcecodepro.ttf");
+
+            Spinner spinner = (Spinner) v.findViewById(R.id.length);
+            Integer[] lengths = new Integer[]{2048, 4096};
+            ArrayAdapter<Integer> adapter = new ArrayAdapter<>(getActivity(),
+                    android.R.layout.simple_spinner_dropdown_item, lengths);
+            spinner.setAdapter(adapter);
+
+            ((EditText) v.findViewById(R.id.passphrase)).setTypeface(monoTypeface);
+
+            CheckBox checkbox = (CheckBox) v.findViewById(R.id.show_passphrase);
+            checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+                @Override
+                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                    EditText editText = (EditText) v.findViewById(R.id.passphrase);
+                    int selection = editText.getSelectionEnd();
+                    if (isChecked) {
+                        editText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
+                    } else {
+                        editText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
+                    }
+                    editText.setSelection(selection);
+                }
+            });
+
+            return v;
+        }
+    }
+
+    // Displays the generated public key .ssh_key.pub
+    public static class ShowSshKeyFragment extends DialogFragment {
+        public ShowSshKeyFragment() {
+        }
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+            LayoutInflater inflater = getActivity().getLayoutInflater();
+            final View v = inflater.inflate(R.layout.fragment_show_ssh_key, null);
+            builder.setView(v);
+
+            TextView textView = (TextView) v.findViewById(R.id.public_key);
+            File file = new File(getActivity().getFilesDir() + "/.ssh_key.pub");
+            try {
+                textView.setText(FileUtils.readFileToString(file));
+            } catch (Exception e) {
+                System.out.println("Exception caught :(");
+                e.printStackTrace();
+            }
+
+            builder.setPositiveButton(getResources().getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+                    if (getActivity() instanceof SshKeyGen)
+                        getActivity().finish();
+                }
+            });
+
+            builder.setNegativeButton(getResources().getString(R.string.dialog_cancel), new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialog, int which) {
+
+                }
+            });
+
+            builder.setNeutralButton(getResources().getString(R.string.ssh_keygen_copy), null);
+
+            final AlertDialog ad = builder.setTitle("Your public key").create();
+            ad.setOnShowListener(new DialogInterface.OnShowListener() {
+                @Override
+                public void onShow(DialogInterface dialog) {
+                    Button b = ad.getButton(AlertDialog.BUTTON_NEUTRAL);
+                    b.setOnClickListener(new View.OnClickListener() {
+                        @Override
+                        public void onClick(View v) {
+                            TextView textView = (TextView) v.findViewById(R.id.public_key);
+                            ClipboardManager clipboard = (ClipboardManager) getActivity().getSystemService(Context.CLIPBOARD_SERVICE);
+                            ClipData clip = ClipData.newPlainText("public key", textView.getText().toString());
+                            clipboard.setPrimaryClip(clip);
+                        }
+                    });
+                }
+            });
+            return ad;
+        }
+    }
+
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (getSupportActionBar() != null)
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+
+        setTitle("Generate SSH Key");
+
+        setContentView(R.layout.activity_ssh_keygen);
+
+        if (savedInstanceState == null) {
+            getFragmentManager().beginTransaction()
+                    .replace(android.R.id.content, new SshKeyGenFragment()).commit();
+        }
+    }
+
+    private class generateTask extends AsyncTask<View, Void, Exception> {
+        private ProgressDialog pd;
+
+        protected Exception doInBackground(View... views) {
+            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+            imm.hideSoftInputFromWindow(views[0].getWindowToken(), 0);
+
+            Spinner spinner = (Spinner) findViewById(R.id.length);
+            int length = (Integer) spinner.getSelectedItem();
+
+            EditText editText = (EditText) findViewById(R.id.passphrase);
+            String passphrase = editText.getText().toString();
+
+            editText = (EditText) findViewById(R.id.comment);
+            String comment = editText.getText().toString();
+
+            JSch jsch = new JSch();
+            try {
+                KeyPair kp = KeyPair.genKeyPair(jsch, KeyPair.RSA, length);
+
+                File file = new File(getFilesDir() + "/.ssh_key");
+                FileOutputStream out = new FileOutputStream(file, false);
+                kp.writePrivateKey(out, passphrase.getBytes());
+
+                file = new File(getFilesDir() + "/.ssh_key.pub");
+                out = new FileOutputStream(file, false);
+                kp.writePublicKey(out, comment);
+                return null;
+            } catch (Exception e) {
+                System.out.println("Exception caught :(");
+                e.printStackTrace();
+                return e;
+            }
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            pd = ProgressDialog.show(SshKeyGen.this, "", "Generating keys");
+
+        }
+
+        @Override
+        protected void onPostExecute(Exception e) {
+            super.onPostExecute(e);
+            pd.dismiss();
+            if (e == null) {
+                Toast.makeText(SshKeyGen.this, "SSH-key generated", Toast.LENGTH_LONG).show();
+                DialogFragment df = new ShowSshKeyFragment();
+                df.show(getFragmentManager(), "public_key");
+                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
+                SharedPreferences.Editor editor = prefs.edit();
+                editor.putBoolean("use_generated_key", true);
+                editor.apply();
+            } else {
+                new AlertDialog.Builder(SshKeyGen.this)
+                        .setTitle("Error while trying to generate the ssh-key")
+                        .setMessage(getResources().getString(R.string.ssh_key_error_dialog_text) + e.getMessage())
+                        .setPositiveButton(getResources().getString(R.string.dialog_ok), new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialogInterface, int i) {
+                                // pass
+                            }
+                        }).show();
+            }
+
+        }
+    }
+
+    // Invoked when 'Generate' button of SshKeyGenFragment clicked. Generates a
+    // private and public key, then replaces the SshKeyGenFragment with a
+    // ShowSshKeyFragment which displays the public key.
+    public void generate(View view) {
+        new generateTask().execute(view);
+    }
+}